Scholarlink

<p>As underground engineering extends to depths of thousands of meters, fault-slip rockbursts induced by stick-slip instability pose a major safety threat. Most laboratory studies on fault stick-slip have used constant normal load (CNL) conditions, ignoring the effects of rock type and normal stiffness—key factors inherent to natural deep faults. To address this, this study employs granite and marble as representative lithologies, and a series of friction sliding experiments were conducted on rock simulated faults under constant normal stiffness (CNS) boundary conditions. The research systematically investigates the coupled regulatory mechanisms of lithological differences and normal stiffness effects on fault stick-slip instability characteristics. Results show that: (1) Both lithologies exhibit regular stick-slip patterns under varied normal stiffness, with granite also showing regular inclusion chaotic stick-slip modes suppressed by increasing stiffness. (2) Seismic source parameters generally increase with normal stiffness for both rocks, but maximum shear and normal stresses increase with stiffness for granite and decrease for marble. (3) Theoretical analysis indicates granite faults are more prone to unstable slip, especially under CNL conditions. From a mineralogical perspective, the controlling factors of stick-slip behavior rank as: mineral composition &gt; grain size &gt; mineral stability. Notably, the influence of these factors may be further exaggerated by the effect of normal stiffness. These research findings offer invaluable insights into the intricacies of deep fault slip behavior.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Mechanistic insights into lithology-normal stiffness coupling effects on stick-slip instability in fault-slip rockburst triggering

  • 期刊论文

  • 发表日期：

    2026年8月3日

查看全文
  • Luosong Zhang,
  • Chuanqing Zhang,
  • Ning Liu,
  • Aoge Zhou,
  • Qiming Xie,
  • Hui Zhou

摘要

As underground engineering extends to depths of thousands of meters, fault-slip rockbursts induced by stick-slip instability pose a major safety threat. Most laboratory studies on fault stick-slip have used constant normal load (CNL) conditions, ignoring the effects of rock type and normal stiffness—key factors inherent to natural deep faults. To address this, this study employs granite and marble as representative lithologies, and a series of friction sliding experiments were conducted on rock simulated faults under constant normal stiffness (CNS) boundary conditions. The research systematically investigates the coupled regulatory mechanisms of lithological differences and normal stiffness effects on fault stick-slip instability characteristics. Results show that: (1) Both lithologies exhibit regular stick-slip patterns under varied normal stiffness, with granite also showing regular inclusion chaotic stick-slip modes suppressed by increasing stiffness. (2) Seismic source parameters generally increase with normal stiffness for both rocks, but maximum shear and normal stresses increase with stiffness for granite and decrease for marble. (3) Theoretical analysis indicates granite faults are more prone to unstable slip, especially under CNL conditions. From a mineralogical perspective, the controlling factors of stick-slip behavior rank as: mineral composition > grain size > mineral stability. Notably, the influence of these factors may be further exaggerated by the effect of normal stiffness. These research findings offer invaluable insights into the intricacies of deep fault slip behavior.